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This paper describes the achieved results of a new space Rubidium Atomic Frequency Standard (named Robust-RAFS) through the description of the internal coefficients influence reduction and the positive consequences in term of clock frequency stability and predictability improvements. Performances achievements during uninterrupted operation of several months demonstrate a monotonic behavior, a stability...
In this paper we investigate methods to achieve highly accurate time synchronization among the satellites of the COMPASS global navigation satellite system (GNSS). Owing to the special design of COMPASS which implements several geo-stationary satellites (GEO), time synchronization can be highly accurate via microwave links between ground stations to the GEO satellites. Serving as space-borne relay...
Accurate and stable frequency reference sources are critical for commercial, navigation, military and scientific space applications. Several levels of frequency references are suitable for space applications. This paper discusses similarities and differences among single distributed oscillators for communications satellites, master oscillator groups for communications systems, and atomic clocks for...
The Generalized Likelihood Ratio Test (GLRT) is a fault detection technique usually employed for revealing faulting behavior by analyzing a finite length sequence of data. This technique is largely employed in many engineering applications and recently its effectiveness has been proved for detecting anomalies also in on-board atomic clocks. Although the large number of scientific publications allows...
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